Hydraulic hand-tool.



H. J. HOGAN.

HYDRAULIC HAND TOOL.

APPLICATION FILED SBPT.29.1913.

Patented Dec. 15. 1914.

xix

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HUG-H J. HOGAN, OF ROCHESTER, PENNSYLVANIA, ASSIGNOR OLE ONESIXTH TOIPIUS M. STRUB, OF ROCHESTER, PENNSYLVANIA.

HYDRAULIC HAND-TOOL.

Specification of Letters Patent.

Patented Dec. is, 1914.

Application filed September 29, 1913. Serial No. 792,432.

To all whom it may concern:

Be it known that I, HUGH J. HOGAN, residing at Rochester, in the countyof Beaver and State of Pennsylvania, a citizen of the nited States, haveinvented or discovered certain new and useful Improvements in HydraulicHand-Tools, of which improvements the followin is a specification.

My invention relates to hydraulic hand tools, wherein a movable tool ortool-carrying member is mounted in a fluid-containing cylinder, and ismoved therein by means of hydraulic pressure; and it is my object toprovide such a hand tool which will be simple and efi'ective, and whichmay be used in tight places.

In the accompanying drawing, which forms part of my specification, Ihave illustrated two tools embodying my invention in substantially thesame form.

Figures 1 and 2 are, respectively, elevation and plan views of a liftingjack; Fig. 3 a sectional plan view taken on the line III-III, Fig. 1;Figs. 1 and 5 partial sectional elevations taken on the broken lines IVIV and V V, respectively, of Fig. 8; and Fig. 6 a view corresponding toFig. 4, but illustrating a metal punch.

In the several figures like numerals are used to designate like part.

As usually constructed, tools of the character contemplated by myinvention comprise an open ended cylinder provided with a plungermovable through the cylinder by hydraulic pressure, and a secondcylinder provided with a piston adapted to be moved through it by handpower. as by the turning of a screw attached to the piston. the twocylinders being connected by a fluid conduit. A body of liquid,preferably oil, is placed in the two cylinders and their connectingconduit to the entire exclusion of air. so that, when the piston ismoved through its cylinder, the liquid will be forced from the pistoncylinder to the plunger cylinder, causing the plunger to move throughits cylinder and to apply power as desired. In such hand tools theplunger cylinder and piston cylinder have usually been rigidly connectedto each other, the result being that a single tool. on account of thefixed relative positions of its parts, cannot be used in many places.

Therefore, the object of my invention. more specifically stated, is toprovide a hinge connection between the two cylinders, the conduitextending between them being through the hinge connection, and beingfluid tight.

Referring to the embodiment of my invention illustrated in the drawings,and particularly to the lifting jack, the power-dd hvering part thereofconsists of an openended cylinder 1. and a plunger 2, movable throughthe cylinder. but having liquid tight engagement with its inner walls.Such engagement is effected by means of a cupwasher 3 clamped to thelower end of the plunger by nut -il. The power-applying portion of thetool is pivoted to the cylinder 1 in a manner hereinafter more fullydescribed, and consists of a cylinder 5, threaded interiorly to receivethe piston 6, which is provided with a cup washer 8, secured thereto bya nut 7. To the end that pressure may be applied with differentintcnsities and at difierent rates to the body of liquid within thecylinders, the piston 6 is tubular and a second and smaller piston ismovable through it. The second piston comprises a screw-threaded rod 9,having a block 10 rotatably mounted on its inner end, and a shoulderedportion 11 at its outer end. The threads of rod 9 preferably engage thepiston 6 through an interposed sleeve nut 12 In order to limit theoutward extent of travel of the piston (3. a cap nut 13 is threaded uponthe outer portion of the cylinder 5, the inwardly-extending portion ofsuch nut being adapted to engage the shoulder 14 of the piston 6.

In. order to effect a fluid tight and me.- chanically efficient hingeconnection between the power-applying and power-delivering parts of thetool. the cylinder 1 is provided with lugs 16 and 17. adapted to receiveand afford bearings for the T-head 18 formed at the end of the cylinder5. The main stem and one leg of the T-head are bored, as shown in Fig.3. to "form a fluid passageway 19, and the cylinder 1 is provided with ahole 20 extending from a point within the lug 17 to the bottom of theplunger 2 when in its extreme lower position. Communication between thepassageways 19 and 20 is had through a small reservoir 21 within the lug20, closed at one end by a plug 22 andat the other end with a washer 23,U- shaped in cross section. A yoke 24 is secured to the cylinder lug 16,as by screws 25,

thus completing the bearing for the unbored leg of the T-head 18. Whenthe parts are thus assembled it will be seen that a secure and fluidtight joint will be had between the two main members of the tool. Tofacilitate the assembling of the joint, and also to increase theefficiency thereof, I attach a U- shaped collar 26 to the T-head 18,adjacent to the lug 16. (See particularly Fig. 5.) This collar helps tokeep the T-head in its proper position, and by removing it, togetherwith the yoke 24, the two main members may be readily taken apart.

My invention may be used in a lifting jack, a metal punch, or any othertool wherein a powerful but short stroke is required. In thedisclosureof Figs. 1 and a inclusive a lifting jack is shown, whereas inFig. 6 I have illustrated a metal punch, the plunger 2* being providedwith a punch 27, and

the cylinder l being provided with a yoke' 28 adapted to receive a die29.

In filling the cylinders with oil or some other suitable liquid, it isdesirable that all the air be driven from both cylinders and theirconnecting passageway. To such an end I provide the cylinder 1 with aremovable screw plug 30. By removing this plug all the air within thecylinder 1 may be displaced by oil.

It will be observed of my invention that, in whatever form it may beembodied, the power-delivering part of the tool being relatively smalland adapted to operate in different lines of direction with relation tothe power-applying portion thereof, may be used in many places and formany purposes that a rigid tool is useless.

I claim as my invention:

1. In a hydraulic hand tool, the combination of a fluid-containingcylinder provided with a cylindrical and a semi-cylindrical bearing lug,a yoke secured to the last named lug, a plunger movable in saidcylinder, a second fluid pressure cylinder having a power-applyingpiston movable therein and provided with a T-head rotatably mounted insaid lugs, a fluid passageway extending between said cylinders throughthe stem and one leg of said T-head.

2. In a hydraulic hand tool, the combination of a fluid-containingcylinder provided with a pair of lugs, one of said lugs forming anannular bearing closed at one end by a removable plug, and the other lugformin a partial bearing completed by a remova le yoke, a lunger movablein said cylinder, a second uid-containing cylinder having a power-aplying piston movable therein and provi ed with a T-head rotatablymounted in said lugs, a fluid passageway extending from the secondcylinder through the stem and one leg of said T-head to saidplug-provided lug, and a passageway from the inner portion of said lastnamed lug to said plunger chamber.

In testimony whereof I have hereunto set my hand.

HUGH J. HOGAN Witnesses:

PAUL H. BALDWIN, P. M. STRUB.

